i have seen this texture line in serveral other maps back in .87 as well - i do believe it has something to do with the "texture" setting (bf2 vid settings) in combination with the nvidia "high performance" or "performance" mode - i blieve that changing the mode to "High Quality" and "textures to high as well is the only fix (if it still works)

i think when creating a map the editor renders with all high settings so the developer does not see those glitches - sometimes its also simply due to unexpected compiling of the map (editor is not wysiwyg imho) afaik

i believe tearing only causes horizontal lines - since the image is built up from top to bottom
but maybe getting vsync on helps - you can force it in the "nvidia control panel" in the "manage 3d setting" section